Air treatment apparatus having a structure defining an array of openings

ABSTRACT

An air treatment apparatus including a plurality of electrodes coupled to a voltage generator. The air treatment apparatus has a structure defining an array of openings.

PRIORITY CLAIM

This application is a continuation of, and claims priority to, U.S.patent application Ser. No. 10/895,799, filed Jul. 21, 2004 which claimspriority from U.S. patent application Ser. No. 10/074,209 filed Feb. 12,2002. The patent application Ser. No. 10/074,209 claims priority fromthe U.S. Provisional Patent Application No. 60/341,518, filed Sep. 13,2001 under 35 U.S.C. 119(e). The patent application Ser. No. 10/074,209,claims priority from U.S. Provisional Patent Application No. 60/306,479,filed Jul. 18, 2001 under 35 U.S.C. 119(e). The patent application Ser.No. 10/074,209, also claims priority from, and is acontinuation-in-part, of U.S. patent application Ser. No. 09/924,624,now abandoned, filed Aug. 8, 2001 which is a continuation of, and claimspriority to, U.S. patent application Ser. No. 09/564,960 filed May 4,2000, now U.S. Pat. No. 6,350,417, which is a continuation-in-part of,and claims priority to, U.S. patent application Ser. No. 09/186,471filed Nov. 5, 1998, now U.S. Pat. No. 6,176,977. U.S. patent applicationSer. No. 10/074,209 is a continuation-in-part of, and claims priorityto, U.S. patent application Ser. No. 09/730,499, filed Dec. 5, 2001, nowU.S. Pat. No. 6,713,026, which is a continuation of, and claims priorityto, U.S. patent application Ser. No. 09/186,471 filed Nov. 5, 1998, nowU.S. Pat. No. 6,176,977. All of the above are incorporated herein byreference.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is related to the following commonly ownedapplications: U.S. Patent Appln. No. Filed Docket No. 11/188,478 Jul.25, 2005 112440-878 10/405,193 Apr. 1, 2003 112440-410 11/071,779 Mar.3, 2005 112440-702 10/994,869 Nov. 22, 2004 112440-703 11/003,752 Dec.3, 2004 112440-721 10/791,561 Mar. 2, 2004 112440-723 10/074,209 Feb.12, 2002 112440-727 10/685,182 Oct. 14, 2003 112440-743 10/944,016 Sep.17, 2004 112440-744 10/795,934 Mar. 8, 2004 112440-761 10/435,289 May 9,2003 112440-762 11/064,797 Feb. 24, 2005 112440-769 11/007,734 Dec. 8,2004 112440-773 11/003,035 Dec. 3, 2004 112440-775 11/007,395 Dec. 8,2004 112440-776 10/809,923 Mar. 25, 2004 112440-784 11/004,397 Dec. 3,2004 112440-798 10/895,799 Jul. 21, 2004 112440-799 10/662,591 Sep. 15,2003 112440-805 11/061,967 Feb. 18, 2005 112440-806 11/150,046 Jun. 10,2005 112440-848 11/188,448 Jul. 25, 2005 112440-877 11/293,538 Dec. 2,2005 112440-932 11/338,974 Jan. 25, 2006 112440-941 11/457,396 Jul. 13,2006 112440-966 11/464,139 Aug. 11, 2006 112440-969 90/007,276 Oct. 29,2004 112440-68 11/041,926 Jan. 21, 2005 112440-72 11/694,281 Mar. 30,2007 112440-1010 11/781,078 Jul. 20, 2007 112440-1027 11/679,606 Feb.27, 2007 112440-1022

All of the above are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates generally to devices that produce anelectro-kinetic flow of air from which particulate matter issubstantially removed.

BACKGROUND

The use of an electric motor to rotate a fan blade to create an airflowhas long been known in the art. Unfortunately, such fans producesubstantial noise, and can present a hazard to children who maybetempted to poke a finger or a pencil into the moving fan blade. Althoughsuch fans can produce substantial airflow (e.g., 1,000 ft³/minute ormore), substantial electrical power is required to operate the motor,and essentially no conditioning of the flowing air occurs.

It is known to provide such fans with a HEPA-compliant filter element toremove particulate matter larger than perhaps 0.3 μm. Unfortunately, theresistance to airflow presented by the filter element may requiredoubling the electric motor size to maintain a desired level of airflow.Further, HEPA-compliant filter elements are expensive, and can representa substantial portion of the sale price of a HEPA-compliant filter-fanunit. While such filter-fan units can condition the air by removinglarge particles, particulate matter small enough to pass through thefilter element is not removed, including bacteria, for example.

It is also known in the art to produce an airflow using electro-kinetictechniques, by which electrical power is converted into a flow of airwithout mechanically moving components. One such system is described inU.S. Pat. No. 4,789,801 to Lee (1988), depicted herein in simplifiedform as FIGS. 1A and 1B and which patent is incorporated herein byreference. System 10 includes an array of first (“emitter”) electrodesor conductive surfaces 20 that are spaced-apart symmetrically from anarray of second (“collector”) electrodes or conductive surfaces 30. Thepositive terminal of a generator such as, for example, pulse generator40 that outputs a train of high voltage pulses (e.g., 0 to perhaps +5KV) is coupled to the first array, and the negative pulse generatorterminal is coupled to the second array in this example. It is to beunderstood that the arrays depicted include multiple electrodes, butthat an array can include or be replaced by a single electrode.

The high voltage pulses ionize the air between the arrays, and create anairflow 50 from the first array toward the second array, withoutrequiring any moving parts. Particulate matter 60 in the air isentrained within the airflow 50 and also moves towards the secondelectrodes 30. Much of the particulate matter is electrostaticallyattracted to the surfaces of the second electrodes, where it remains,thus conditioning the flow of air exiting system 10. Further, the highvoltage field present between the electrode arrays can release ozoneinto the ambient environment, which can eliminate odors that areentrained in the airflow.

In the particular embodiment of FIG. 1A, first electrodes 20 arecircular in cross-section, having a diameter of about 0.003″ (0.08 mm),whereas the second electrodes 30 are substantially larger in area anddefine a “teardrop” shape in cross-section. The ratio of cross-sectionalradii of curvature between the bulbous front nose of the secondelectrode and the first electrodes exceeds 10:1. As shown in FIG. 1A,the bulbous front surfaces of the second electrodes face the firstelectrodes, and the somewhat “sharp” trailing edges face the exitdirection of the airflow. The “sharp” trailing edges on the secondelectrodes promote good electrostatic attachment of particulate matterentrained in the airflow.

In another particular embodiment shown herein as FIG. 1B, secondelectrodes 30 are symmetrical and elongated in cross-section. Theelongated trailing edges on the second electrodes provide increased areaupon which particulate matter entrained in the airflow can attach.

While the electrostatic techniques disclosed by the '801 patent areadvantageous over conventional electric fan-filter units, furtherincreased air transport-conditioning efficiency would be advantageous.

SUMMARY OF THE INVENTION

The present invention provides an apparatus as follows.

One aspect of the present invention is to provide an electro-kinetic airtransporter-conditioner that produces an enhanced airflow velocity,enhanced particle collection, and an appropriate amount of ozoneproduction.

An embodiment includes one or more focus or leading electrodes. Eachfocus or leading electrode may be located upstream to, or even with,each first electrode. The focus or leading electrodes assists incontrolling the flow of ionized particles within the airflow. The focusor leading electrode shapes the electrostatic field generated by eachfirst electrode within the electrode assembly.

Another embodiment includes one or more trailing electrodes. Eachtrailing electrode can be located downstream of a second electrode. Thetrailing electrode can assist in neutralizing the amount of ions exitingthis embodiment of the invention, and can further assist in collectingionized particles. The trailing electrode can alternatively enhance theflow of negative ions from the transporter-conditioner. Additionally,the trailing electrodes can improve the laminar flow properties of theairflow exiting the air transporter-conditioner.

Another embodiment of the invention includes at least one interstitialelectrode located between two second electrodes. The interstitialelectrode can also assist in the collection of particulate matter by thesecond electrodes.

In yet another embodiment of the invention, one or more of the secondelectrodes are formed to have an enhanced protective end or trailingsurface which assists in the operation and cleaning of the embodiment.

In still a further embodiment of the invention, one or more firstelectrode are of enhanced length in order to increase the emissivity ofthe first electrode.

Other objects, aspects, features and advantages of the invention willappear from the following description in which the preferred embodimentshave been set forth in detail, in conjunction with the accompanyingdrawings and also from the following claim.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A-1B; FIG. 1A is a plan, cross-sectional view, of a firstembodiment of an electro-kinetic air transporter-conditioner systemaccording to the prior art; FIG. 1B is a plan, cross-sectional view, ofa second embodiment of an electro-kinetic air transporter-conditionersystem according to the prior art.

FIGS. 2A-2B; FIG. 2A is a perspective view of a typical embodiment ofthe housing of an electro-kinetic air transporter-conditioner; FIG. 2Bis a perspective view of the embodiment shown in FIG. 2A illustratingthe removable second electrodes.

FIG. 3 is an electrical block diagram of the present invention.

FIGS. 4A-4F; FIG. 4A is a perspective view showing an embodiment of anelectrode assembly according to the present invention; FIG. 4B is a planview of the embodiment illustrated in FIG. 4A; FIG. 4C is a perspectiveview showing another embodiment of an electrode assembly according tothe present invention; FIG. 4D is a plan view illustrating a modifiedversion of the embodiment of FIG. 4C; FIG. 4E is a perspective viewshowing yet another embodiment of an electrode assembly according to thepresent invention; FIG. 4F is a plan view of the embodiment of FIG. 4E.

FIGS. 5A-5B; FIG. 5A is a perspective view of still another embodimentof the present invention illustrating the leading or focus electrodeadded to the embodiment shown in FIG. 4A; FIG. 5B is a plan view of amodified embodiment of the present invention similar to that shown inFIG. 5A illustrating a protective end on each second electrode.

FIGS. 6A-6D; FIG. 6A is a perspective view of a further embodiment ofthe present invention, illustrating a leading or focus electrode addedto the embodiment shown in FIG. 4C; FIG. 6B is a perspective view of amodified embodiment of the present invention as shown in FIG. 6A; FIG.6C is a perspective view of a modified embodiment of the presentinvention as shown in FIG. 6B; FIG. 6D is a modified embodiment of thepresent invention, illustrating a leading or focus electrode added tothe embodiment in FIG. 4D.

FIGS. 7A-7C; FIG. 7A is a perspective view of another embodiment of thepresent invention, illustrating a leading or focus electrode added tothe embodiment shown in FIG. 4E; FIG. 7B is a perspective view of anembodiment modified from that shown in FIG. 7A; FIG. 7C is a perspectiveview of an embodiment modified from that shown in FIG. 7B.

FIGS. 8A-8C; FIG. 8A is a perspective view of still a further embodimentof the present invention, illustrating another embodiment of the leadingor focus electrode; FIG. 8B is a perspective view of an embodimentmodified from that shown in FIG. 5A; FIG. 8C is a perspective view ofyet another embodiment.

FIGS. 9A-9C; FIG. 9A is perspective view of a further embodiment of thepresent invention; FIG. 9B is a partial view of an embodiment modifiedfrom that shown in FIG. 1A; FIG. 9C is another embodiment modified fromthat shown in FIG. 9A.

FIGS. 10A-10D; FIG. 10A is a perspective view of another embodiment ofthe present invention, illustrating a trailing electrode added to theembodiment in FIG. 7A; FIG. 10B is a plan view of the embodiment shownin FIG. 10A; FIG. 10C is a plan view of a further embodiment of thepresent invention; FIG. 10D is a plan view of another embodiment of thepresent invention similar to FIG. 10C.

FIGS. 11A-11F; FIG. 11A is a plan view of still another embodiment ofthe present invention; FIG. 11B is a plan view of an embodiment modifiedfrom that shown in FIG. 11A; FIG. 11C is a plan view of a furtherembodiment of the present invention; FIG. 11D is a plan view of anembodiment modified from that shown in FIG. 11C; FIG. 11E is a plan viewof a further embodiment of the present invention; FIG. 11F is a planview of an embodiment modified from that shown in FIG. 11F.

FIGS. 12A-12C; FIG. 12A is a perspective view of still anotherembodiment of the present invention; FIG. 12B is a perspective view of afurther embodiment of the present invention; FIG. 12C is a perspectiveview of yet another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Overall Air Transporter-Conditioner System Configuration:

FIGS. 2A and 2B depict an electro-kinetic air transporter-conditionersystem 100 whose housing 102 includes preferably rear-located intakevents or louvers 104 and preferably front located exhaust vents 106, anda base pedestal 108. If desired a single vent can provide and be used asboth an air intake and an air exhaust with an air inlet channel and anair exhaust channel communicating with the vent and the electrodes.Preferably the housing is freestanding and/or upstandingly verticaland/or elongated. Internal to the transporter housing is an iongenerating unit 160, preferably powered by an AC:DC power supply that isenergizable or excitable using switch S1. S1, which along with the otherbelow described user operated switches are conveniently located at thetop 103 of the unit 100. Ion generating unit 160 is self-contained inthat other ambient air, nothing is required from beyond the transporterhousing, save external operating potential, for operation of the presentinvention.

The upper surface of housing 102 includes a user-liftable handle member112 to which is affixed a second array 240 of collector electrodes 242within an electrode assembly 220. Electrode assembly 220 also comprisesa first array of emitter electrodes 230, or a single first electrodeshown here as a single wire or wire-shaped electrode 232. (The terms“wire” and “wire-shaped” shall be used interchangeably herein to mean anelectrode either made from a wire or, if thicker or stiffer than a wire,having the appearance of a wire.) In the embodiment shown, liftingmember 112 lifts second array electrodes 240 upward, causing the secondelectrode to telescope out of the top of the housing and, if desired,out of unit 100 for cleaning, while the first electrode array 230remains within unit 100. As is evident from the figure, the second arrayof electrode can be lifted vertically out from the top 103 of unit 100along the longitudinal axis or direction of the elongated housing 102.This arrangement with the second electrodes removable from the top 103of the unit 100, makes it easy for the user to pull the secondelectrodes out for cleaning. In FIG. 2B, the bottom ends of secondelectrodes 242 are connected to a member 113, to which is attached amechanism 500, which includes a flexible member and a slot for capturingand cleaning the first electrode 232, whenever handle member 112 ismoved upward or downward by a user.

The first and second arrays of electrodes are coupled to the outputterminals of ion generating unit 160, as best seen in FIG. 3.

The general shape of the embodiment of the invention shown in FIGS. 2Aand 2B is that of a figure eight in cross-section, although other shapesare within the spirit and scope of the invention. The top-to-bottomheight of the preferred embodiment is in one preferred embodiment, 1 m,with a left-to-right width of preferably 15 cm, and a front-to-backdepth of perhaps 10 cm, although other dimensions and shapes can ofcourse be used. A louvered construction provides ample inlet and outletventing in an economical housing configuration. There need be no realdistinction between vents 104 and 106, except their location relative tothe second electrodes. These vents serve to ensure that an adequate flowof ambient air can be drawn into or made available to the unit 100, andthat an adequate flow of ionized air that includes appropriate amountsof O₃ flows out from unit 100.

As will be described, when unit 100 is energized with S1, high voltageor high potential output by ion generator 160 produces ions at the firstelectrode, which ions are attracted to the second electrodes. Themovement of the ions in an “IN” to “OUT” direction carries with the ionsair molecules, thus electro-kinetically producing an outflow of ionizedair. The “IN” notation in FIGS. 2A and 2B denote the intake of ambientair with particulate matter 60. The “OUT” notation in the figuresdenotes the outflow of cleaned air substantially devoid of theparticulate matter, which particulates matter adheres electrostaticallyto the surface of the second electrodes. In the process of generatingthe ionized airflow appropriate amounts of ozone (O₃) are beneficiallyproduced. It may be desired to provide the inner surface of housing 102with an electrostatic shield to reduces detectable electromagneticradiation. For example, a metal shield could be disposed within thehousing, or portions of the interior of the housing can be coated with ametallic paint to reduce such radiation.

The housing preferably has a substantially oval-shaped or -ellipticallyshaped cross-section with dimpled side grooves. Thus, as indicatedabove, the cross-section looks somewhat like a figure eight. It iswithin the scope of the present invention for the housing to have adifferent shaped cross-section such as, but not limited to, arectangular shape, an egg shape, a tear-drop shape, or circular shape.The housing preferably has a tall, thin configuration. As will becomeapparent later, the housing is preferably functionally shaped to containthe electrode assembly.

As mentioned above, the housing has an inlet and an outlet. Both theinlet and the outlet are covered by fins or louvers. Each fin is a thinridge spaced-apart from the next fin, so that each fin creates minimalresistance as air flows through the housing. The fins are horizontal andare directed across the elongated vertical upstanding housing of theunit. Thus, the fins are substantially perpendicular in this preferredembodiment to the electrodes. The inlet and outlet fins are aligned togive the unit a “see through” appearance. Thus, a user can “see through”the unit from the inlet to the outlet. The user will see no moving partswithin the housing, but just a quiet unit that cleans the air passingtherethrough. Alternatively the fins can be parallel with the electrodesin another preferred embodiment. Other orientations of fins andelectrodes are possible in other embodiments.

As best seen in FIG. 3, ion generating unit 160 includes a high voltagegenerator unit 170 and circuitry 180 for converting raw alternatingvoltage (e.g., 117 VAC) into direct current (“DC”) voltage. Circuitry180 preferably includes circuitry controlling the shape and/or dutycycle of the generator unit output voltage (which control is alteredwith user switch S2). Circuitry 180 preferably also includes a pulsemode component, coupled to switch S3, to temporarily provide a burst ofincreased output ozone. Circuitry 180 can also include a timer circuitand a visual indicator such as a light emitting diode (“LED”). The LEDor other indicator (including, if desired, an audible indicator) signalswhen ion generation quits occurring. The timer can automatically haltgeneration of ions and/or ozone after some predetermined time, e.g., 30minutes.

The high voltage generator unit 170 preferably comprises a low voltageoscillator circuit 190 of perhaps 20 KHz frequency, that outputs lowvoltage pulses to an electronic switch 200, e.g., a thyristor or thelike. Switch 200 switchably couples the low voltage pulses to the inputwinding of a step-up transformer T1. The secondary winding of T1 iscoupled to a high voltage multiplier circuit 210 that outputs highvoltage pulses. Preferably the circuitry and components comprising highvoltage pulse generator 170 and circuit 180 are fabricated on a printedcircuit board that is mounted within housing 102. If desired, externalaudio input (e.g., from a stereo tuner) could be suitably coupled tooscillator 190 to acoustically modulate the kinetic airflow produced byunit 160. The result would be an electrostatic loudspeaker, whose outputairflow is audible to the human ear in accordance with the audio inputsignal. Further, the output air stream would still include ions andozone.

Output pulses from high voltage generator 170 preferably are at least 10KV peak-to-peak with an effective DC offset of, for example, half thepeak-to-peak voltage, and have a frequency of, for example, 20 KHz.Frequency of oscillation can include other values, but frequency of atleast about 20 KHz is preferred as being inaudible to humans. If petswill be in the same room as the unit 100, it may be desired to utilizeand even higher operating frequency, to prevent pet discomfort and/orhowling by the pet. The pulse train output preferably has a duty cycleof for example 10%, which will promote battery lifetime if live currentis not used. Of course, different peak-peak amplitudes, DC offsets,pulse train waveshapes, duty cycle, and/or repetition frequencies can beused instead. Indeed, a 100% pulse train (e.g., an essentially DC highvoltage) may be used, albeit with shorter battery lifetime. Thus,generator unit 170 for this embodiment can be referred to as a highvoltage pulse generator. Unit 170 functions as a DC:DC high voltagegenerator, and could be implemented using other circuitry and/ortechniques to output high voltage pulses that are input to electrodeassembly 220.

As noted, outflow (OUT) preferably includes appropriate amounts of ozonethat can remove odors and preferably destroy or at least substantiallyalter bacteria, germs, and other living (or quasi-living) mattersubjected to the outflow. Thus, when switch S1 is closed and thegenerator 170 has sufficient operating potential, pulses from highvoltage pulse generator unit 170 create an outflow (OUT) of ionized airand ozone. When S1 is closed, LED will visually signal when ionizationis occurring.

Preferably operating parameters of unit 100 are set during manufactureand are generally not user-adjustable. For example, with respect tooperating parameters, increasing the peak-to-peak output voltage and/orduty cycle in the high voltage pulses generated by unit 170 can increasethe airflow rate, ion content, and ozone content. These parameters canbe set by the user by adjusting switch S2 as disclosed below. In thepreferred embodiment, output flowrate is about 200 feet/minute, ioncontent is about 2,000,000/cc and ozone content is about 40 ppb (overambient) to perhaps 2,000 ppb (over ambient). Decreasing the ratio ofthe radius of the nose of the second electrodes to the radius of thefirst electrode or decreasing the ratio of the cross-sectioned area ofthe second electrode to the first electrode below about 20:1 willdecrease flow rate, as will decreasing the peak-to-peak voltage and/orduty cycle of the high voltage pulses coupled between the first andsecond electrode arrays.

In practice, unit 100 is placed in a room and connected to anappropriate source of operating potential, typically 117 VAC. With S1energizing ionization unit 160, systems 100 emits ionized air andpreferably some ozone via outlet vents 106. The airflow, coupled withthe ions and ozone freshens the air in the room, and the ozone canbeneficially destroy or at least diminish the undesired effects ofcertain odors, bacteria, germs, and the like. The airflow is indeedelectro-kinetically produced, in that there are no intentionally movingparts within unit 100. (Some mechanical vibration may occur within theelectrodes.).

Having described various aspects of this embodiment of the invention ingeneral, preferred embodiments of electrode assembly 220 are nowdescribed. In the various embodiments, electrode assembly 220 comprisesa first array 230 of at least one electrode or conductive surface 232,and further comprises a second array 240 of preferably at least oneelectrode or conductive surface 242. Understandably material(s) forelectrodes 232 and 242 should conduct electricity, be resistant tocorrosive effects from the application of high voltage, yet be strongenough to be cleaned.

In the various electrode assemblies to be described herein, electrode(s)232 in the first electrode array 230 are preferably fabricated fromtungsten. Tungsten is sufficiently robust in order to withstandcleaning, has a high melting point to retard breakdown due toionization, and has a rough exterior surface that seems to promoteefficient ionization. On the other hand, electrode(s) 242 preferablyhave a highly polished exterior surface to minimize unwantedpoint-to-point radiation. As such, electrode(s) 242 preferably arefabricated from stainless steel and/or brass, among other materials. Thepolished surface of electrode(s) 232 also promotes ease of electrodecleaning.

In contrast to the prior art electrodes disclosed by the '801 patent,electrodes 232 and 242, are light weight, easy to fabricate, and lendthemselves to mass production. Further, electrodes 232 and 242 describedherein promote more efficient generation of ionized air, and appropriateamounts of ozone, (indicated in several of the figures as O₃).

Electrode Assembly with First and Second Electrodes:

FIGS. 4A-4F

FIGS. 4A-4F illustrate various configurations of the electrode assembly220. The output from high voltage pulse generator unit 170 is coupled toan electrode assembly 220 that comprises a first electrode array 230 anda second electrode array 240. Again, instead of arrays, singleelectrodes or single conductive surfaces can be substituted for one orboth array 230 and array 240.

The positive output terminal of unit 170 is coupled to first electrodearray 230, and the negative output terminal is coupled to secondelectrode array 240. It is believed that with this arrangement the netpolarity of the emitted ions is positive, e.g., more positive ions thannegative ions are emitted. This coupling polarity has been found to workwell, including minimizing unwanted audible electrode vibration or hum.However, while generation of positive ions is conducive to a relativelysilent airflow, from a health standpoint, it is desired that the outputairflow be richer in negative ions, not positive ions. It is noted thatin some embodiments, one port (preferably the negative port) of the highvoltage pulse generator can in fact be the ambient air. Thus, electrodesin the second array need not be connected to the high voltage pulsegenerator using a wire. Nonetheless, there will be an “effectiveconnection” between the second array electrodes and one output port ofthe high voltage pulse generator, in this instance, via ambient air.Alternatively the negative output terminal of unit 170 can be connectedto the first electrode array 230 and the positive output terminal can beconnected to the second electrode array 240.

With this arrangement an electrostatic flow of air is created, goingfrom the first electrode array towards the second electrode array. (Thisflow is denoted “OUT” in the figures.) Accordingly electrode assembly220 is mounted within transporter system 100 such that second electrodearray 240 is closer to the OUT vents and first electrode array 230 iscloser to the IN vents.

When voltage or pulses from high voltage pulse generator 170 are coupledacross first and second electrode arrays 230 and 240, a plasma-likefield is created surrounding electrodes 232 in first array 230. Thiselectric field ionizes the ambient air between the first and secondelectrode arrays and establishes an “OUT” airflow that moves towards thesecond array. It is understood that the IN flow enters via vent(s) 104,and that the OUT flow exits via vent(s) 106.

Ozone and ions are generated simultaneously by the first arrayelectrodes 232, essentially as a function of the potential fromgenerator 170 coupled to the first array of electrodes or conductivesurfaces. Ozone generation can be increased or decreased by increasingor decreasing the potential at the first array. Coupling an oppositepolarity potential to the second array electrodes 242 essentiallyaccelerates the motion of ions generated at the first array, producingthe airflow denoted as “OUT” in the figures. As the ions and ionizedparticulates move toward the second array, the ions and ionizedparticles push or move air molecules toward the second array. Therelative velocity of this motion may be increased, by way of example, bydecreasing the potential at the second array relative to the potentialat the first array.

For example, if +10 KV were applied to the first array electrode(s), andno potential were applied to the second array electrode(s), a cloud ofions (whose net charge is positive) would form adjacent the firstelectrode array. Further, the relatively high 10 KV potential wouldgenerate substantial ozone. By coupling a relatively negative potentialto the second array electrode(s), the velocity of the air mass moved bythe net emitted ions increases.

On the other hand, if it were desired to maintain the same effectiveoutflow (OUT) velocity, but to generate less ozone, the exemplary 10 KVpotential could be divided between the electrode arrays. For example,generator 170 could provide +4 KV (or some other fraction) to the firstarray electrodes and −6 KV (or some other fraction) to the second arrayelectrodes. In this example, it is understood that the +4 KV and the −6KV are measured relative to ground. Understandably it is desired thatthe unit 100 operates to output appropriate amounts of ozone.Accordingly, the high voltage is preferably fractionalized with about +4KV applied to the first array electrodes and about −6 KV applied to thesecond array electrodes.

In the embodiments of FIGS. 4A and 4B, electrode assembly 220 comprisesa first array 230 of wire-shaped electrodes 232, and a second array 240of generally “U”-shaped electrodes 242. In preferred embodiments, thenumber N1 of electrodes comprising the first array can preferably differby one relative to the number N2 of electrodes comprising the secondarray 240. In many of the embodiments shown, N2>N1. However, if desired,additional first electrodes 232 could be added at the outer ends ofarray 230 such that N1>N2, e.g., five first electrodes 232 compared tofour second electrodes 242.

As previously indicated first or emitter electrodes 232 are preferablylengths of tungsten wire, whereas electrodes 242 are formed from sheetmetal, preferably stainless steel, although brass or other sheet metalcould be used. The sheet metal is readily configured to define sideregions 244 and bulbous nose region 246, forming the hollow, elongated“U”-shaped electrodes 242. While FIG. 4A depicts four electrodes 242 insecond array 240 and three electrodes 232 in first array 230, as notedpreviously, other numbers of electrodes in each array could be used,preferably retaining a symmetrically staggered configuration as shown.It is seen in FIG. 4A that while particulate matter 60 is present in theincoming (IN) air, the outflow (OUT) air is substantially devoid ofparticulate matter, which adheres to the preferably large surface areaprovided by the side regions 244 of the second array electrodes 242.

FIG. 4B illustrates that the spaced-apart configuration between thefirst and second arrays 230,240 is staggered. Preferably, each firstarray electrode 232 is substantially equidistant from two second arrayelectrodes 242. This symmetrical staggering has been found to be anefficient electrode placement. Preferably, in this embodiment, thestaggering geometry is symmetrical in that adjacent electrodes 232 oradjacent electrodes 242 are spaced-apart a constant distance, Y1 and Y2respectively. However, a non-symmetrical configuration could also beused. Also, it is understood that the number of electrodes 232 and 242may differ from what is shown.

In the embodiment of FIG. 4A, typically dimensions are as follows:diameter of electrodes 232, R1, is about 0.08 mm, distances Y1 and Y2are each about 16 mm, distance X1 is about 16 mm, distance L is about 20mm, and electrode heights Z1 and Z2 are each about 1 m. The width W ofelectrodes 242 is preferably about 4 mm, and the thickness of thematerial from which electrodes 242 are formed is about 0.5 mm. Of courseother dimensions and shapes could be used. For example, preferreddimensions for distance X1 may vary between 12-30 mm, and the distanceY2 may vary between 15-30 mm. It is preferred that electrodes 232 have asmall diameter. A wire having a small diameter, such as R1, generates ahigh voltage field and has a high emissivity. Both characteristics arebeneficial for generating ions. At the same time, it is desired thatelectrodes 232 (as well as electrodes 242) be sufficiently robust towithstand occasional cleaning.

Electrodes 232 in first array 230 are coupled by a conductor 234 to afirst (preferably positive) output port of high voltage pulse generator170. Electrodes 242 in second array 240 are coupled by a conductor 249to a second (preferably negative) output port of high voltage generator170. The electrodes maybe electrically connected to the conductors 234or 249 at various locations. By way of example only, FIG. 4B depictsconductor 249 making connection with some electrodes 242 internal tobulbous end 246, while other electrodes 242 make electrical connectionto conductor 249 elsewhere on the electrode 242. Electrical connectionto the various electrodes 242 could also be made on the electrodeexternal surface, provided no substantial impairment of the outflowairstream results; however it has been found to be preferable that theconnection is made internally.

In this and the other embodiments to be described herein, ionizationappears to occur at the electrodes 232 in the first electrode array 230,with ozone production occurring as a function of high voltage arcing.For example, increasing the peak-to-peak voltage amplitude and/or dutycycle of the pulses from the high voltage pulse generator 170 canincrease ozone content in the output flow of ionized air. If desired,user-control S2 can be used to somewhat vary ozone content by varyingamplitude and/or duty cycle. Specific circuitry for achieving suchcontrol is known in the art and need not be described in detail herein.

Note the inclusion in FIGS. 4A and 4B of at least one output controllingelectrodes 243, preferably electrically coupled to the same potential asthe second array electrodes 242. Electrode 243 preferably defines apointed shape in side profile, e.g., a triangle. The sharp point onelectrodes 243 causes generation of substantial negative ions (since theelectrode is coupled to relatively negative high potential). Thesenegative ions neutralize excess positive ions otherwise present in theoutput airflow, such that the OUT flow has a net negative charge.Electrodes 243 is preferably stainless steel, copper, or other conductormaterial, and is perhaps 20 mm high and about 12 mm wide at the base.The inclusion of one electrode 243 has been found sufficient to providea sufficient number of output negative ions, but more such electrodesmay be included.

In the embodiments of FIGS. 4A, 4B and 4C, each “U”-shaped electrode 242has two trailing surface or sides 244 that promote efficient kinetictransport of the outflow of ionized air and ozone. For the embodiment ofFIG. 4C, there is the inclusion on at least one portion of a trailingedge of a pointed electrode region 243′. Electrode region 243′ helpspromote output of negative ions, in the same fashion that was previouslydescribed with respect to electrodes 243, as shown in FIGS. 4A and 4B.

In FIG. 4C and the figures to follow, the particulate matter is omittedfor ease of illustration. However, from what was shown in FIGS. 4A-4B,particulate matter will be present in the incoming air, and will besubstantially absent from the outgoing air. As has been described,particulate matter 60 typically will be electrostatically precipitatedupon the surface area of electrodes 242.

As discussed above and as depicted by FIG. 4C, it is relativelyunimportant where on an electrode array electrical connection is made.Thus, first array electrodes 232 are shown electrically connectedtogether at their bottom regions by conductor 234, whereas second arrayelectrodes 242 are shown electrically connected together in their middleregions by the conductor 249. Both arrays maybe connected together inmore than one region, e.g., at the top and at the bottom. It ispreferred that the wire or strips or other inter-connecting mechanismsbe at the top, bottom, or periphery of the second array electrodes 242,so as to minimize obstructing stream air movement through the housing210.

It is noted that the embodiments of FIGS. 4C and 4D depict somewhattruncated versions of the second electrodes 242. Whereas dimension L inthe embodiment of FIGS. 4A and 4B was about 20 mm, in FIGS. 4C and 4D, Lhas been shortened to about 8 mm. Other dimensions in FIG. 4C preferablyare similar to those stated for FIGS. 4A and 4B. It will be appreciatedthat the configuration of second electrode array 240 in FIG. 4C can bemore robust than the configuration of FIGS. 4A and 4B, by virtue of theshorter trailing edge geometry. As noted earlier, a symmetricalstaggered geometry for the first and second electrode arrays ispreferred for the configuration of FIG. 4C.

In the embodiment of FIG. 4D, the outermost second electrodes, denoted242-1 and 242-4, have substantially no outermost trailing edges.Dimension L in FIG. 4D is preferably about 3 mm, and other dimensionsmaybe as stated for the configuration of FIGS. 4A and 4B. Again, theratio of the radius or surface areas between the first electrode 232 andthe second electrodes 242 for the embodiment of FIG. 4D preferablyexceeds about 20:1.

FIGS. 4E and 4F depict another embodiment of electrode assembly 220, inwhich the first electrode array 230 comprises a single wire electrode232, and the second electrode array 240 comprises a single pair ofcurved “L”-shaped electrodes 242, in cross-section. Typical dimensions,where different than what has been stated for earlier-describedembodiments, are X1≈12 mm, Y2≈5 mm, and L1≈3 mm. The effective surfacearea or radius ratio is again greater than about 20:1. The fewerelectrodes comprising assembly 220 in FIGS. 4E and 4F promote economy ofconstruction, and ease of cleaning, although more than one electrode232, and more than two electrodes 242 could of course be employed. Thisparticular embodiment incorporates the staggered symmetry describedearlier, in which electrode 232 is equidistant from two electrodes 242.Other geometric arrangements, which may not be equidistant, are withinthe spirit and scope of the invention.

Electrode Assembly with an Upstream Focus Electrode:

FIGS. 5A-5B

The embodiments illustrated in FIGS. 5A-5B are somewhat similar to thepreviously described embodiments in FIGS. 4A-4B. The electrode assembly220 includes a first array of electrodes 230 and a second array ofelectrodes 240. Again, for this and the other embodiments, the term“array of electrodes” may refer to a single electrode or a plurality ofelectrodes. Preferably, the number of electrodes 232 in the first arrayof electrodes 230 will differ by one relative to the number ofelectrodes 242 in the second array of electrodes 240. The distances L,X1, Y1, Y2, Z1 and Z2 for this embodiment are similar to thosepreviously described in FIG. 4A.

As shown in FIG. 5A, the electrode assembly 220 preferably adds a third,or leading, or focus, or directional electrode 224 a, 224 b, 224 c(generally referred to as “electrode 224”) upstream of each firstelectrode 232-1, 232-2, 232-3. The focus electrode 224 produces anenhanced airflow velocity exiting the devices 100 or 200. In general,the third focus electrode 224 directs the airflow, and ions generated bythe first electrode 232, towards the second electrodes 242. Each thirdfocus electrode 224 is a distance X2 upstream from at least one of thefirst electrodes 232. The distance X2 is preferably 5-6 mm, or four tofive diameters of the focus electrode 224. However, the third focuselectrode 224 can be further from or closer to the first electrode 232.

The third focus electrode 224 illustrated in FIG. 5A is a rod-shapedelectrode. The third focus electrode 224 can also comprise other shapesthat preferably do not contain any sharp edges. The third focuselectrode 224 is preferably manufactured from material that will noterode or oxidize, such as stainless steel. The diameter of the thirdfocus electrode 224, in a preferred embodiment, is at least fifteentimes greater than the diameter of the first electrode 232. The diameterof the third focus electrode 224 can be larger or smaller. The diameterof the third focus electrode 224 is preferably large enough so thatthird focus electrode 224 does not function as an ion emitting surfacewhen electrically connected with the first electrode 232. The maximumdiameter of the third focus electrode 224 is somewhat constrained. Asthe diameter increases, the third focus electrode 224 will begin tonoticeably impair the airflow rate of the units 100 or 200. Therefore,the diameter of the third electrode 224 is balanced between the need toform a non-ion emitting surface and airflow properties of the unit 100or 200.

In a preferred embodiment, each third focus electrodes 224 a, 224 b, 224c are electrically connected with the first array 230 and the highvoltage generator 170 by the conductor 234. As shown in FIG. 5A, thethird focus electrodes 224 are electrically connected to the samepositive outlet of the high voltage generator 170 as the first array230. Accordingly, the first electrode 232 and the third focus electrode224 generate a positive electrical field. Since the electrical fieldsgenerated by the third focus electrode 224 and the first electrode 232are both positive, the positive field generated by the third focuselectrode 224 can push, or repel, or direct, the positive fieldgenerated by the first electrode 232 towards the second array 240. Forexample, the positive field generated by the third focus electrode 224 awill push, or repel, or direct, the positive field generated by thefirst electrode 232-1 towards the second array 240. In general, thethird focus electrode 224 shapes the electrical field generated by eachelectrode 232 in the first array 230. This shaping effect is believe todecrease the amount of ozone generated by the electrode assembly 220 andincreases the airflow of the units 100 and 200.

The particles within the airflow are positively charged by the ionsgenerated by the first electrode 232. As previously mentioned, thepositively charged particles are collected by the negatively chargedsecond electrodes 242. The third focus electrode 224 also directs theairflow towards the second electrodes 242 by guiding the chargedparticles towards the trailing sides 244 of each second electrode 242.It is believed that the airflow will travel around the third focuselectrode 224, partially focusing the airflow towards the trailing sides244, improving the collection rate of the electrode assembly 220.

The third focus electrode 224 maybe located at various positionsupstream of each first electrode 232. By way of example only, a thirdfocus electrode 224 b is located directly upstream of the firstelectrode 232-2 so that the center of the third focus electrode 224 b isin-line and symmetrically aligned with the first electrode 232-2, asshown by extension line B. Extension line B is located midway betweenthe second electrode 242-2 and the second electrode 242-3.

Alternatively, a third focus electrode 224 can also be located at anangle relative to the first electrode 232. For example, a third focuselectrode 224 a can be located upstream of the first electrode 232-1along a line extending from the middle of the nose 246 of the secondelectrode 242-2 through the center of the first electrode 232-1, asshown by extension line A. The third focus electrode 224 a is in-lineand symmetrically aligned with the first electrode 232-1 along extensionline A. Similarly, the third electrode 224 c is located upstream to thefirst electrode 232-3 along a line extending from the middle of the nose246 of the second electrode 242-3 through the first electrode 232-3, asshown by extension line C. The third focus electrode 224 c is in-lineand symmetrically aligned with the first electrode 232-3 along extensionline C. It is within the scope of the present invention for theelectrode assembly 220 to include third focus electrodes 224 that areboth directly upstream and at an angle to the first electrodes 232, asdepicted in FIG. 5A. Thus the focus electrodes fan out relating to thefirst electrodes.

FIG. 5B illustrates that an electrode assembly 220 may contain multiplethird focus electrodes 224 upstream of each first electrode 232. By wayof example only, the third focus electrode 224 a 2 is in-line andsymmetrically aligned with the third focus electrode 224 a 1, as shownby extension line A. In a preferred embodiment, only the third focuselectrodes 224 a 1, 224 b 1, 224 c 1 are electrically connected to thehigh voltage generator 170 by conductor 234. Accordingly, not all of thethird electrodes 224 are at the same operating potential. In theembodiment shown in FIG. 5B, the third focus electrodes 224 a 1, 224 b1, 224 c 1 are at the same electrical potential as the first electrodes232, while the third focus electrodes 224 a 2, 224 b 2, 224 c 2 arefloating. Alternatively, the third focus electrodes 224 a 2, 224 b 2 and224 c 2 maybe electrically connected to the high voltage generator 170by the conductor 234.

FIG. 5B illustrates that each second electrode 242 may also have aprotective end 241. In the previous embodiments, each “U”-shaped secondelectrode 242 has an open end. Typically, the end of each trailing sideor side wall 244 contains sharp edges. The gap between the trailingsides or side walls 244, and the sharp edges at the end of the trailingsides or side walls 244, generate unwanted eddy currents. The eddycurrents create a “backdraft,” or airflow traveling from the outlettowards the inlet, which slow down the airflow rate of the units 100 or200.

In a preferred embodiment, the protective end 241 is created by shaping,or rolling, the trailing sides or side walls 244 inward and pressingthem together, forming a rounded trailing end with no gap between thetrailing sides or side walls of each second electrode 242. Accordinglythe side walls have outer surfaces, and the outer surface of end of theside walls are bent back adjacent to the trailing ends of the side wallsso that the outer surface of the side walls are adjacent to, or face, ortouch each other. Accordingly a smooth trailing edge is integrallyformed on the second electrode. If desired, it is within the scope ofthe invention to spot weld the rounded ends together along the length ofthe second electrode 242. It is also within the scope of the presentinvention to form the protective end 241 by other methods such as, butnot limited to, placing a strap of plastic across each end of thetrailing sides 244 for the full length of the second electrode 242. Therounded or capped end is an improvement over the previous electrodes 242without a protective end 241. Eliminating the gap between the trailingsides 244 also reduces or eliminates the eddy currents typicallygenerated by the second electrode 242. The rounded protective end alsoprovides a smooth surface for purpose of cleaning the second electrode.Accordingly in this embodiment the collector electrode is a one-piece,integrally formed, electrode with a protection end.

FIGS. 6A-6D

FIG. 6A illustrates an electrode assembly 220 including a first array ofelectrodes 230 having three wire-shaped first electrodes 232-1, 232-2,232-3 (generally referred to as “electrode 232”) and a second array ofelectrodes 240 having four “U”-shaped second electrodes 242-1, 242-2,242-3, 242-4 (generally referred to as “electrode 242”). Each firstelectrode 232 is electrically connected to the high voltage generator170 at the bottom region, whereas each second electrode 242 iselectrically connected to the high-voltage generator 170 in the middleto illustrate that the first and second electrodes 232, 242 can beelectrically connected in a variety of locations.

The second electrode 242 in FIG. 6A is a similar version of the secondelectrode 242 shown in FIG. 4C. The distance L has been shortened toabout 8 mm, while the other dimensions X1, Y1, Y2, Z1, Z2 are similar tothose shown in FIG. 4A.

A third leading or focus electrode 224 is located upstream of each firstelectrode 232. The innermost third focus electrode 224 b is locateddirectly upstream of the first electrode 232-2, as shown by extensionline B. Extension line B is located midway between the second electrodes242-2, 242-3. The third focus electrodes 224 a, 224 c are at an anglewith respect to the first electrodes 232-1, 232-3. For example, thethird focus electrode 224 a is upstream to the first electrode 232-1along a line extending from the middle of the nose 246 of the secondelectrode 242-2 extending through the center of the first electrode232-1, as shown by extension line A. The third electrode 224 c islocated upstream of the first electrode 232-3 along a line extendingfrom the center of the nose 246 of the second electrode 242-3 throughthe center of the first electrode 232-3, as shown by extension line C.Accordingly and preferably the focus electrodes fan out relative to thefirst electrodes as an aid for directing the flow of ions and chargedparticles. FIG. 6B illustrates that the third focus electrodes 224 andthe first electrode 232 may be electrically connected to the highvoltage generator 170 by conductor 234.

FIG. 6C illustrates that a pair of third focus electrodes 224 maybelocated upstream of each first electrode 232. Preferably, the multiplethird focus electrodes 224 are in-line and symmetrically aligned witheach other. For example, the third focus electrode 224 a 2 is in-lineand symmetrically aligned with the third focus electrode 224 a 1, alongextension line A. As previously mentioned, preferably only third focuselectrodes 224 a 1, 224 b 1, 224 c 1 are electrically connected with thefirst electrodes 232 by conductor 234. It is also within the scope ofthe present invention to have none or all of the third focus electrodes224 electrically connected to the high voltage generator 170.

FIG. 6D illustrates third focus electrodes 224 added to the electrodeassembly 220 shown in FIG. 4D. Preferably, a third focus electrode 224is located upstream of each first electrode 232. For example, the thirdfocus electrode 224 b is in-line and symmetrically aligned with thefirst electrode 232-2, as shown by extension line B. Extension line B islocated midway between the second electrodes 242-2, 242-3. The thirdfocus electrode 224 a is in-line and symmetrically aligned with thefirst electrode 232-1, as shown by extension line A. Similarly, thethird electrode 224 c is in-line and symmetrically aligned with thefirst electrode 232-3, as shown by extension line C. Extension lines A-Cextend from the middle of the nose 246 of the “U”-shaped secondelectrodes 242-2, 242-3 through the first electrodes 232-1, 232-3,respectively. In a preferred embodiment, the third electrodes 224 a, 224b, 224 c with the high voltage generator 170 by the conductor 234. Thisembodiment can also include a pair of third focus electrodes 224upstream of each first electrode 232 as is depicted in FIG. 6C.

FIGS. 7A-7C

FIGS. 7A-7C illustrate that the electrode assembly 220 shown in FIG. 4Ecan include a third focus electrode upstream of the first array ofelectrodes 230 comprising a single wire electrode 232. Preferably, thecenter of the third focus electrode 224 is in-line and symmetricallyaligned with the center of the first electrode 232, as shown byextension line B. Extension line B is located midway between the secondelectrodes 242. The distances X1, X2, Y1, Y2, Z1 and Z2 are similar tothe embodiments previously described. The first electrode 232 and thesecond electrode 242 may be electrically connected to the high-voltagegenerator 170 by conductor 234, 249 respectively. It is within the scopeof the present invention to connect the first and second electrodes toopposite ends of the high voltage generator 170 (e.g., the firstelectrode 232 maybe negatively charged and the second electrode 242 maybe positively charged). In a preferred embodiment the third focuselectrode 224 is also electrically connected to the high voltagegenerator 170.

FIG. 7B illustrates that a pair of third focus electrodes 224 a, 224 bmaybe located upstream of the first electrode 232. The third focuselectrodes 224 a, 224 b are in-line and symmetrically aligned with thefirst electrode 232, as shown by extension line B. Extension line B islocated midway between the second electrodes 242. Preferably, the thirdfocus electrode 224 b is upstream of third focus electrode 224 a adistance equal to the diameter of a third focus electrode 224. In apreferred embodiment, only the third focus electrode 224 a iselectrically connected to the high voltage generator 170. It is withinthe scope of the present invention to electrically connect both thirdfocus electrodes 224 a, 224 b to the high voltage generator 170.

FIG. 7C illustrates that each third focus electrode 224 can be locatedat an angle with respect to the first electrode 232. Similar to theprevious embodiments, the third focus electrode 224 a 1 and 224 b 1 islocated a distance X2 upstream from the first electrode 232. By way ofexample only, the third focus electrodes 224 a 1, 224 a 2 are locatedalong a line extending from the middle of the second electrode 242-2through the center of the first electrode 232, as shown by extensionline A. Similarly, the third focus electrodes 224 b 1, 224 b 2 are alonga line extending from the middle of the second electrode 242-1 throughthe middle of the first electrode 232, as shown by extension line B. Thethird focus electrode 224 a 2 is in-line and symmetrically aligned withthe third focus electrode 224 a 1 along extension line A. Similarly, thethird focus electrode 224 b 2 is in line and symmetrically aligned withthe third focus electrode 224 b 1 along extension line B. The thirdfocus electrodes 224 are fanned out and form a “V” pattern upstream offirst electrode 232. In a preferred embodiment, only the third focuselectrodes 224 a 1 and 224 b 1 are electrically connected to thehigh-voltage generator 170 by conductor 234. It is within the scope ofthe invention to electrically connect the third focus electrodes 224 aand 224 b 2 to the high voltage generator 170.

FIGS. 8A-8B

The previously described embodiments of the electrode assembly 220disclose a rod-shaped third focus electrode 224 upstream of each firstelectrode 232. FIG. 8A illustrates an alternative configuration for thethird focus electrode 224. By way of example only, the electrodeassembly 220 may include a “U”-shaped or possibly “C”-shaped third focuselectrode 224 upstream of each first electrode 232. Further the thirdfocus electrode 224 can have other curved configurations such as, butnot limited to, circular-shaped, elliptical-shaped, andparabolically-shaped other concave shapes facing the first electrode232. In a preferred embodiment, the third focus electrode 224 has holes225 extending through, forming a perforated surface to minimize theresistance of the third focus electrode 224 on the airflow rate.

In a preferred embodiment, the third focus electrode 224 is electricallyconnected to the high voltage generator 170 by conductor 234. The thirdfocus electrode 224 in FIG. 8A is preferably not an ion emittingsurface. Similar to previous embodiments, the third focus electrode 224generates a positive electric field and pushes or repels the electricfield generated by the first electrode 232 towards the second array 240.

FIG. 8B illustrates that a perforated “U”-shaped or “C”-shaped thirdfocus electrode 224 can be incorporated into the electrode assembly 220shown in FIG. 4A. Even though only two configurations of the electrodeassembly 220 are shown with the perforated “U”-shaped third focuselectrode 224, all the embodiments described in FIGS. 5A-12C mayincorporate the perforated “U”-shaped third focus electrode 224. It isalso within the scope of the invention to have multiple perforated“U”-shaped third focus electrodes 224 upstream of each first electrode232. Further in other embodiment the “U”-shaped third focus electrode224 can be made of a screen or a mesh.

FIG. 8C illustrates third focus electrodes 224 similar to those depictedin FIG. 8B, except that the third focus electrodes 224 are rotated by180° to preset a convex surface facing to the first electrodes 232 inorder to focus and direct the field of ions and airflow from the firstelectrode 232 toward the second electrode 242. These third focuselectrodes 224 shown in FIGS. 8A-8C are located along extension lines A,B, C similar to previously described embodiments.

FIGS. 9A-9C

FIG. 9A illustrates a pin-ring configuration of the electrode assembly220. The electrode assembly 220 contains a cone-shaped ortriangular-shaped first electrode 232, a ring-shaped second electrode242 downstream of the first electrode 232, and a third focus electrode250 upstream of the first electrode 232. The third focus electrodes 250may be electrically connected to the high voltage generator 170.Preferably the focus electrode 250 is spaced from the first electrode232 a distance that is in accordance with the other embodimentsdescribed herein. Alternatively, the third focus electrode 250 can havea floating potential. As indicated by phantom elements 232′, 242′, theelectrode assembly 220 can comprise a plurality of such pin-like andring-like elements. The plurality of pin-ring configurations as depictedin FIG. 9A can be positioned one above the other along the elongatedhousing of the invention. Such a plurality of pin-ring configurationscan of course operate in another embodiment without the third focuselectrode. It is understood that this plurality of pin-ringconfigurations can be upstanding and elongated along the elongateddirection of said housing and can replace the first and secondelectrodes shown, for example, in FIG. 2B and be removable much as thesecond electrode in FIG. 2B is removable. Preferably, the firstelectrode 232 is tungsten, and the second electrode 242 is stainlesssteel. Typical dimensions for the embodiment of FIG. 9A are L1≈10millimeters, X1≈9.5 millimeters, T≈0.5 millimeters and the diameter ofthe opening 246≈12 millimeters.

The electrical properties and characteristics of the third focuselectrode 250 is similar to the third focus electrode 224 described inprevious embodiments. In contrast to the rod-shaped physicalcharacteristic of the previous embodiments, the shape the third focuselectrode 250 is a concave disc, with the concave surface preferablyfacing toward the second electrodes 242. The third focus electrode 250preferably has holes extending therethrough to minimize the disruptionin airflow. It is within the scope of the present invention for thethird focus electrode 250 to comprise other shapes such as, but notlimited to, a convex disc a parabolic disc, a spherical disc, or otherconvex or concave shapes or a rectangle, or other planar surface and bewithin the spirit and scope of the invention. The diameter of the thirdfocus electrode 250 is preferably at least fifteen times greater thanthe diameter of the first electrode 232. The focus electrode 250 canalso be made of a screen or a mesh.

The second electrode 242 has an opening 246. The opening 246 ispreferably circular in this embodiment. It is within the scope of thepresent invention that the opening 246 can comprise other shapes suchas, but not limited to, rectangular, hexagonal or octagonal. The secondelectrode 242 has a collar 247 (see FIG. 9B) surrounding the opening246. The collar 247 attracts the dust contained within the airstreampassing through the opening 246. As seen in the FIGS. 9B and 9C thecollar 247 includes a downstream extending tubular portion 248 which cancollect particles. As a result, the airstream emitted by the electrodeassembly 220 has a reduced dust content.

Other similar pin-ring embodiments are shown in FIGS. 9B-9C. Forexample, the first electrode 232 can comprise a rod-shaped electrodehaving a tapered end. In FIG. 9B, a detailed cross-sectional view of thecentral portion of the second electrode 242 in FIG. 9A is shown.Preferably, the collar 247 is positioned in relation to the firstelectrode 232, such that the ionization paths from the distal tip of thefirst electrode 232 to the collar 247 have substantially equal pathlengths. Thus, while the distal tip (or emitting tip) of the firstelectrode 232 is advantageously small to concentrate the electric field,the adjacent regions of the second electrode 242 preferably provide manyequidistant inter-electrode paths. The lines drawn in phantom in FIGS.9B and 9C depict theoretical electric force field lines emanating fromthe first electrode 232 and terminating on the curved surface of thesecond electrode 242. Preferably, the bulk of the field emanates withinabout 45 degrees of coaxial axis between the first electrode 232 and thesecond electrode 242.

In FIG. 9C, one or more first electrodes 232 are replaced by aconductive block 232″ of carbon fibers, the block having a distalsurface in which projecting fibers 233-1, . . . 233-N take on theappearance of a “bed of nails.” The projecting fibers can each act as anemitter electrode and provide a plurality of emitting surfaces. Over aperiod of time, some or all of the electrodes will literally beconsumed, where upon the block 232″ may be replaced. Materials otherthan graphite maybe used for block 232″ providing that the material hasa surface with projecting conductive fibers such as 233-N.

Electrode Assembly with a Downstream Trailing Electrode:

FIGS. 10A-10D

FIGS. 10A-10C illustrate an electrode assembly 220 having an array oftrailing electrodes 245 added to an electrode assembly 220 similar tothat shown in FIG. 7A. It is understood that an alternative embodimentsimilar to FIG. 10A can include a trailing electrode or electrodeswithout any focus electrodes and be within the spirit and scope of theinventions. Referring now to FIGS. 10A-10B, each trailing electrode 245is located downstream of the second array of electrodes 240. Preferably,the trailing electrodes are located downstream from the secondelectrodes 242 by at least three times the radius R2 (see FIG. 10B).Further, the trailing electrodes 245 are preferably directly downstreamof each second electrode 242 so as not to interfere with the flow ofair. Also, the trailing electrode 245 is aerodynamically smooth, forexample, circular, elliptical, or teardrops shaped in cross-section soas not to unduly interfere with the smoothness of the airflow thereby.In a preferred embodiment, the trailing electrodes 245 are electricallyconnected to the same outlet of the high voltage generator 170 as thesecond array of electrodes 240. As shown in FIG. 10A, the secondelectrodes 242 and the trailing electrodes 245 have a negativeelectrical charge. This arrangement can introduce more negative chargesinto the air stream. Alternatively, the trailing electrodes 245 can havea floating potential if they are not electrically connected. Thetrailing electrodes 245 can also be grounded in other embodiments.Further alternatively, as shown in FIG. 10D, the trailing electrode 245can be formed with the second electrode out of a sheet of metal formedin the shape of the second electrode and then extending to the positionof the trailing electrode and formed as a hollow trailing electrode witha peripheral wall that is about the shape of the outer surface of thetrailing electrode 245 depicted in FIG. 10C.

When the trailing electrodes 245 are electrically connected to the highvoltage generator 170, the positively charged particles within theairflow are also attracted to and collect on, the trailing electrodes.In a typical electrode assembly with no trailing electrode 245, most ofthe particles will collect on the surface area of the second electrodes242. However, some particles will pass through the unit 200 withoutbeing collected by the second electrodes 242. Thus, the trailingelectrodes 245 serve as a second surface area to collect the positivelycharged particles. The trailing electrodes 245 also can deflect chargedparticles toward the second electrodes.

The trailing electrodes 245 preferably also emit a small amount ofnegative ions into the airflow. These negative ions will neutralize thepositive ions emitted by the first electrodes 232. If the positive ionsemitted by the first electrodes 232 are not neutralized before theairflow reaches the outlet 260, the outlet fins 212 can becomeelectrically charged and particles within the airflow may tend to stickto the fins 212. If this occurs, eventually the amount of particlescollected by the fins 212 will block or minimize the airflow exiting theunit 200.

FIG. 10C illustrates another embodiment of the electrode assembly 200,having trailing electrodes 245 added to an embodiment similar to thatshown in FIG. 7C. The trailing electrodes 245 are located downstream ofthe second array 240 similar to the previously described embodimentsabove. It is within the scope of the present invention to electricallyconnect the trailing electrodes 245 to the high voltage generator 170.As shown in FIG. 10C, all of the third focus electrodes 224 areelectrically connected to the high voltage generator 170. In a preferredembodiment, only the third focus electrodes 224 a 1, 224 b 1 areelectrically connected to the high voltage generator 170. The thirdfocus electrodes 224 a 2, 224 b 2 have a floating potential.

Electrode Assemblies with Various Combinations of Focus Electrodes,Trailing Electrodes and Enhanced Second Electrodes with Protective Ends:

FIGS. 11A-11D

FIG. 11A illustrates an electrode assembly 220 that includes a firstarray of electrodes 230 having two wire-shaped electrodes 232-1, 232-2(generally referred to as “electrode 232”) and a second array ofelectrodes 240 having three “U”-shaped electrodes 242-1, 242-2, 242-3(generally referred to as “electrode 242”). This configuration is incontrast to, for example, the configurations of FIG. 9A, wherein thereare three first emitter electrodes 232 and four second collectorelectrodes 242.

Upstream from each first electrode 232, at a distance X2, is a thirdfocus electrode 224. Each third focus electrode 224 a, 224 b is at anangle with respect to a first electrode 232. For example, the thirdfocus electrode 224 a is preferably along a line extending from themiddle of the nose 246 of the second electrode 242-2 through the centerof the first electrode 232-1, as shown by extension line A. The thirdfocus electrode 224 a is in-line and symmetrically aligned with thefirst electrode 232-1 along extension line A. Similarly, the third focuselectrode 224 b is located along a line extending from middle of thenose 246 of the second electrode 242-2 through the center of the firstelectrode 232-2, as shown by extension line B. The third focus electrode224 b is in-line and symmetrically aligned with the first electrode232-2 along extension line B. As previously described, the diameter ofeach third focus electrode 224 is preferably at least fifteen timesgreater than the diameter of the first electrode 232.

As shown in FIG. 11A, and similar to the embodiment shown in FIG. 5B,each second electrode preferably has a protective end 241. In apreferred embodiment, the third focus electrodes 224 are electricallyconnected to the high voltage generator 170 (not shown). It is withinthe spirit and scope of the invention to not electrically connect thethird focus electrodes 224.

FIG. 11B illustrates that multiple third focus electrodes 224 may belocated upstream of each first emitter electrode 232. For example, thethird focus electrode 224 a 2 is in-line and symmetrically aligned withthe third focus electrode 224 a 1 along extension line A. Similarly, thethird focus electrode 224 b 2 is in-line and symmetrically aligned withthe third focus electrode 242 b 1 along extension line B. It is withinthe scope of the present invention to electrically connect all, or noneof, the third focus electrodes 224 to the high-voltage generator 170. Ina preferred embodiment, only the third focus electrodes 224 a 1, 224 b 1are electrically connected to the high voltage generator 170, with thethird focus electrodes 224 a 2, 224 b 2 having a floating potential.

FIG. 11C illustrates that the electrode assembly 220 shown in FIG. 11Amay also include a trailing electrode 245 downstream of each secondelectrode 242. Each trailing electrode 245 is in-line with the secondelectrode so as not to interfere with airflow past the second electrode242. Each trailing electrode 245 is preferably located a distancedownstream of each second electrode 242 equal to at least three timesthe width W of the second electrode 242. It is within the scope of thepresent invention for the trailing electrode to by located at otherdistances downstream. The diameter of the trailing anode 245 ispreferably no greater than the width W of the second electrode 242 tolimit the interference of the airflow coming off the second electrode242.

One aspect of the trailing electrode 245 is to direct the air trailingoff the second electrode 242 and provide a more laminar flow of airexiting the outlet 260. Another aspect of the trailing electrode 245 isto neutralize the positive ions generated by the first array 230 andcollect particles within the airflow. As shown in FIG. 11C, eachtrailing electrode 245 is electrically connected to a second electrode242 by a conductor 248. Thus, the trailing electrode 245 is negativelycharged, and serves as a collecting surface, similar to the secondelectrode 242, attracts the positively charged particles in the airflow.As previously described, the electrically connected trailing electrode245 also emits negative ions to neutralize the positive ions emitted bythe first electrodes 232.

FIG. 11D illustrates that a pair of third focus electrodes 224 may belocated upstream of each first electrode 232. For example, the thirdfocus electrode 224 a 2 is upstream of the third focus electrode 224 a 1so that the third focus electrodes 224 a 1, 224 a 2 are in-line andsymmetrically aligned with each other along extension line A. Similarly,the third focus electrode 224 b 2 is in line and symmetrically alignedwith the third focus electrode 224 b 1 along extension line B. Aspreviously described, preferably only the third focus electrodes 224 a1, 224 b 1 are electrically connected to the high voltage generator 170,while the third focus electrodes 224 a 2, 224 b 2 have a floatingpotential. It is within the spirit and scope of the present invention toelectrically connect all, or none, of the third focus electrodes to thehigh voltage generator 170.

Electrode Assemblies with Second Collector Electrodes havingInterstitial Electrodes:

FIGS. 11E-11F

FIG. 11E illustrates another embodiment of the electrode assembly 220with an interstitial electrode 246. In this embodiment, the interstitialelectrode 246 is located midway between the second electrodes 242. Forexample, the interstitial electrode 246 a is located midway between thesecond electrodes 242-1, 242-2, while the interstitial electrode 246 bis located midway between second electrodes 242-2, 242-3. Preferably,the interstitial electrode 246 a, 246 b are electrically connected tothe first electrodes 232, and generate an electrical field with the samepositive or negative charge as the first electrodes 232. Theinterstitial electrode 246 and the first electrode 232 then have thesame polarity. Accordingly, particles traveling toward the interstitialelectrode 246 will be repelled by the interstitial electrode 246 towardsthe second electrodes 242. Alternatively, the interstitial electrodescan have a floating potential or be grounded.

It is to be understood that interstitial electrodes 246 a, 246 b mayalso be closer to one second collector electrode than to the other.Also, the interstitial electrodes 246 a, 246 b are preferably locatedsubstantially near or at the protective end 241 or ends of the trailingsides 244, as depicted in FIG. 11E. Still further the interstitialelectrode can be substantially located along a line between the twotrailing portions or ends of the second electrodes. These rear positionsare preferred as the interstitial electrodes can cause the positivelycharged particle to deflect towards the trailing sides 244 along theentire length of the negatively charged second collector electrode 242,in order for the second collector electrode 242 to collect moreparticles from the airflow.

Still further, the interstitial electrodes 246 a, 246 b can be locatedupstream along the trailing side 244 of the second collector electrodes244. However, the closer the interstitial electrodes 246 a, 246 b get tothe nose 246 of the second electrode 242, generally the less effectiveinterstitial electrodes 246 a, 246 b are in urging positively chargedparticles toward the entire length the second electrodes 242.Preferably, the interstitial electrodes 246 a, 246 b are wire-shaped andsmaller or substantially smaller in diameter than the width “W” of thesecond collector electrodes 242. For example, the interstitialelectrodes can have a diameter of, the same as, or on the order, of thediameter of the first electrodes. For example, the interstitialelectrodes can have a diameter of one-sixteenth of an inch. Also, thediameter of the interstitial electrodes 246 a, 246 b is substantiallyless than the distance between second collector electrodes, as indicatedby Y2. Further the interstitial electrode can have a length or diameterin the downstream direction that is substantially less than the lengthof the second electrode in the downstream direction. The reason for thissize of the interstitial electrodes 246 a, 246 b is so that theinterstitial electrodes 246 a, 246 b have a minimal effect on theairflow rate exiting the device 100 or 200.

FIG. 11F illustrates that the electrode assembly 220 in FIG. 11E caninclude a pair of third electrodes 224 upstream of each first electrode232. As previously described, the pair of third electrodes 224 arepreferably in-line and symmetrically aligned with each other. Forexample, the third electrode 224 a 2 is in-line and symmetricallyaligned with the third electrode 224 a 1 along extension line A.Extension line A preferably extends from the middle of the nose 246 ofthe second electrode 242-2 through the center of the first electrode232-1. As previously disclosed, in a preferred embodiment, only thethird electrodes 224 a 1, 224 b 1 are electrically connected to the highvoltage generator 170. In FIG. 11F, a plurality of interstitialelectrode 296 a and 246 b are located between the second electrodes 242.Preferably these interstitial electrodes are in-line and have apotential gradient with an increasing voltage potential on eachsuccessive interstitial electrode in the downstream direction in orderto urge particles toward the second electrodes. In this situation thevoltage on the interstitial electrodes would have the same sign as thevoltage of the first electrode 232.

Electrode Assembly with an Enhanced First Emitter Electrode Being Slack:

FIGS. 12A-12C

The previously described embodiments of the electrode assembly 220include a first array of electrodes 230 having at least one wire-shapedelectrode 232. It is within the scope of the present invention for thefirst array of electrodes 230 to contain electrodes consisting of othershapes and configurations.

FIG. 12A illustrates that the first array of electrodes 230 may includecurved wire-shaped electrodes 252. The curved wire-shaped electrode 252is an ion emitting surface and generates an electric field similar tothe previously described wire-shaped electrodes 232. Also similar toprevious embodiments, each second electrode 242 is “downstream,” andeach third focus electrode 224 is “upstream,” to the curved wire-shapedelectrodes 252. The electrical properties and characteristics of thesecond electrode 242 and the third focus electrode 224 are similar tothe previously described embodiment shown in FIG. 5A. It is to beunderstood that an alternative embodiment of FIG. 12A can exclude thefocus electrodes and be within the spirit and scope of the invention.

As shown in FIG. 12A, positive ions are generated and emitted by thefirst electrode 252. In general, the quantity of negative ions generatedand emitted by the first electrode is proportional to the surface areaof the first electrode. The height Z1 of the first electrode 252 isequal to the height Z1 of the previously disclosed wire-shaped electrode232. However, the total length of the electrode 252 is greater than thetotal length of the electrode 232. By way of example only, and in apreferred embodiment, if the electrode 252 was straightened out thecurved or slack wire electrode 252 is 15-30% longer than a rod orwire-shaped electrode 232. The electrode 252 is allowed to be slack toachieve the shorter height Z1. When a wire is held slack, the wire mayform a curved shape similar to the first electrode 252 shown in FIG.12A. The greater total length of the electrode 252 translates to alarger surface area than the wire-shaped electrode 232. Thus, theelectrode 252 will generate and emit more ions than the electrode 232.Ions emitted by the first electrode array attach to the particulatematter within the airflow. The charged particulate matter is attractedto, and collected by, the oppositely charged second collector electrodes242. Since the electrodes 252 generate and emit more ions than thepreviously described electrodes 232, more particulate matter will beremoved from the airflow.

FIG. 12B illustrates that the first array of electrodes 230 may includeflat coil wire-shaped electrodes 254. Each flat coil wire-shapedelectrode 254 also has a larger surface area than the previouslydisclosed wire-shaped electrode 232. By way of example only, if theelectrode 254 was straightened out, the electrode 254 will have a totallength that is preferably 10% longer than the electrode 232. Since theheight of the electrode 254 remains at Z1, the electrode 254 has a“kinked” configuration as shown in FIG. 12B. This greater lengthtranslates to a larger surface area of the electrode 254 than thesurface area of the electrode 232. Accordingly, the electrode 254 willgenerate and emit a greater number of ions than electrode 232. It is tobe understood that an alternative embodiment of FIG. 12B can exclude thefocus electrodes and be within the spirit and scope of the invention.

FIG. 12C illustrates that the first array of electrodes 230 may alsoinclude coiled wire-shaped electrodes 256. Again, the height Z1 of theelectrodes 256 is similar to the height Z1 of the previously describedelectrodes 232. However, the total length of the electrodes 256 isgreater than the total length of the electrodes 232. In a preferredembodiment, if the coiled electrode 256 was straightened out theelectrodes 256 will have a total length two to three times longer thanthe wire-shaped electrodes 232. Thus, the electrodes 256 have a largersurface area than the electrodes 232, and generate and emit more ionsthan the first electrodes 232. The diameter of the wire that is coiledto produce the electrode 256 is similar to the diameter of the electrode232. The diameter of the electrode 256 itself is preferably 1-3 mm, butcan be smaller in accordance with the diameter of first emitterelectrode 232. The diameter of the electrode 256 shall remain smallenough so that the electrode 256 has a high emissivity and is an ionemitting surface. It is to be understood that an alternative embodimentof FIG. 12C can exclude the focus electrodes and be within the spiritand scope of the invention.

The electrodes 252, 254 and 256 shown in FIGS. 12A-12C maybeincorporated into any of the electrode assembly 220 configurationspreviously disclosed in this application.

The foregoing description of the preferred embodiments of the presentinvention has been provided for the purposes of illustration anddescription. It is not intended to be exhaustive or to limit theinvention to the precise forms disclosed. Many modifications andvariations will be apparent to the practitioner skilled in the art.Modifications and variations maybe made to the disclosed embodimentswithout departing from the subject and spirit of the invention asdefined by the following claims. Embodiments were chosen and describedin order to best describe the principles of the invention and itspractical application, thereby enabling others skilled in the art tounderstand the invention, the various embodiments and with variousmodifications that are suited to the particular use contemplated. It isintended that the scope of the invention be defined by the followingclaims and their equivalents.

1. An air treatment apparatus comprising: a housing defining an innerspace; a first electrode; a second electrode; a voltage generatoroperatively coupled to the first electrode and the second electrode soas to generate a flow of air from the first electrode to the secondelectrode along a path; a structure supported by the housing andpositioned in the inner space, a portion of the structure being in linewith the path, the structure defining an array of openings; and a panelcoupled to the housing, the panel defining a plurality of openings, thepanel positioned outside the inner space.
 2. The air treatment apparatusof claim 1, which includes a plurality of second electrodes operativelycoupled to the voltage generator.
 3. The air treatment apparatus ofclaim 1, wherein the first electrode includes a member selected from thegroup consisting of: a wire and a plate-shaped member.
 4. The airtreatment apparatus of claim 1, wherein the second electrode includes aplate-shaped member.
 5. The air treatment apparatus of claim 1, whereinthe second electrode is configured to be removable from the housing. 6.The air treatment apparatus of claim 5, wherein the second electrode isconfigured to be removable through a top of the housing.
 7. An airtreatment apparatus comprising: a housing defining an inner space; anemitter electrode; a collector electrode; a voltage generatoroperatively coupled to the emitter electrode and the collector electrodeso as to generate a flow of air from the emitter electrode to thecollector electrode along a path; a structure supported by the housingand positioned in the inner space, a portion of the structure being inline with the path, the structure defining an array of openings; and avent coupled to the housing, the vent defining a plurality of openings,the vent positioned outside the inner space.
 8. The air treatmentapparatus of claim 7, wherein the structure has a perforated surface. 9.The air treatment apparatus of claim 7, wherein the array has a formselected from the group consisting of: a grid form and a matrix form.10. The air treatment apparatus of claim 7, which includes a pluralityof collector electrodes operatively coupled to the voltage generator.11. The air treatment apparatus of claim 7, wherein the emitterelectrode includes a member selected from the group consisting of: awire and a plate-shaped member.
 12. The air treatment apparatus of claim7, wherein the collector electrode is configured to be removable fromthe housing.
 13. An air treatment apparatus comprising: an elongatedhousing defining an inner space; an elongated emitter electrode, theemitter electrode having a cylindrical shape; an elongated collectorelectrode configured to be removed from the housing, a portion of thecollector electrode having a substantially flat shape; a voltagegenerator operatively coupled to the emitter electrode and the collectorelectrode so as to generate a flow of air from the emitter electrode tothe collector electrode along a path; a structure supported by thehousing and positioned in the inner space, a portion of the structurebeing in line with the path, the structure defining a grid of openings;and a plurality of vents coupled to opposite sides of the housing, eachof the vents defining a plurality of openings, the vents beingpositioned outside the inner space.
 14. The air treatment apparatus ofclaim 13, which includes a plurality of collector electrodes operativelycoupled to the voltage generator.
 15. The air treatment apparatus ofclaim 13, wherein the emitter electrode includes a member selected fromthe group consisting of: a wire and a plate-shaped member.
 16. The airtreatment apparatus of claim 13, wherein the collector electrodeincludes a plate-shaped member.
 17. The air treatment apparatus of claim13, wherein the collector electrode is configured to be removablethrough a top of the housing.
 18. The air treatment apparatus of claim13, which includes a user handle coupled to the collector electrode.